Improvement in lifting-jacks



T. J. WOODS. Lifting-Jack.

No. 204,408. Patented May 28, I878.

. ifww La fli UNITED STATES PATENT OEEIoE.

THOMAS J. WOODS, OF WESTERLY, RHODE ISLAND.

IMPROVEMENT IN LIFTlNG-JACKS.

Specification forming part of Letters Patent No. 204,408., dated May 28,1878 application filed April 22, 1878.

To all whom it may concern:

Be it known that I, THOMAS J. Woons, of Westerly, in the county ofProvidence and State of Rhode Island, have invented certain new anduseful Improvements in Carriage- Jaoks; and I hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming part of thisspecitieation, in which Figure l is a side view of my improvedcarriage-jack, shown in the position when the hand-lever is locked andthe carriage supported by the same. Fig. 2 is a sectional view of thesame, showing the lever-locking device and the friction-rolls.

The invention consists in the novel arrangement, with the verticalsliding bar resting against friction-rolls, of the slotted bracket,which can be adjusted at any height, and the hand-lever provided with anautomatic locking device, as will be more fully set forth hereinafter,and pointed out in the claims.

In the drawings, A is the vertical standard; b, a bar sliding verticallyin proper supports; a, a slotted bracket, which, when held at rightangle with the bar b, may be easily moved up or down on the same, butwhich, when released, will clamp itself in any position on the bar b bythe lower edge of one end of the slot resting against one edge of thebar b and the upper edge of the opposite end of the slot against theother edge of the bar, and the greater the strain the more firmly willthe bracket be so held. To allow the bar b to slide with littlefriction, when a heavy weight is to be lifted, I insert thefriction-rollers d d, against which the bar rests.

e is the hand-lever hinged on the upper end of the standard A, andconnected with the bar b by a link, f. By depressing the handle end ofthe lever e, the bar b, and with it the bracket 0, and any weightresting on the same is raised; and to hold the weight so raised Iprovide the hinged or pivoted latch g, which enters a slot in a plate onthe standard A, as is clearly shown in the drawings, and the weight isthus supported and held for any desired time. When the same is to belowered, the latch g is raised by depressing the thumb-piece g on thelatch, which can be done by one finger of the same hand that holds thelever e, and the carriage or other weight may be lowered.

This carriage-jack is readily adjusted to any kind of carriage, operateswith little friction, is cheap in construction, strong and durable, andso light that it can be easily handled and carried from place to place.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. The combination, in a carriagejack, with the bar b,of the adjustable slotted bracket 0 and the friction-rollers d d,substantially as and for the purpose set forth. c

2. The combination, with the standard A, of the hinged lever e, thelatch 9, provided with the thumb-piece g, the herb, connected with thelever by a link, and the adjustable bracket 0, slotted and held on thebar, sub stantially as and for the purpose set forth.

THOMAS J. WOODS.

Witnesses EUGENE B. PENDLETON, WILLIAM WALTON.

